#! /bin/sh
#
### BEGIN INIT INFO
# Provides:          kamailio
# Required-Start:    $syslog $network $local_fs $remote_fs $time
# Required-Stop:     $syslog $network $local_fs $remote_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Should-Start:      postgresql mysql radius
# Should-Stop:       postgresql mysql radius
# Short-Description: Start the Kamailio SIP proxy server
# Description:       Start the Kamailio SIP proxy server
### END INIT INFO


ulimit -n 999999

PATH=/sbin:/bin:/usr/sbin:/usr/bin
DAEMON=/sbin/kamailio
NAME=kamailio
DESC=Kamailio
HOMEDIR=/var/run/kamailio
PIDFILE=$HOMEDIR/$NAME.pid
DEFAULTS=/etc/default/kamailio
CFGFILE=/etc/kamailio/kamailio.cfg
RUN_KAMAILIO=yes


# Do not start kamailio if fork=no is set in the config file
# otherwise the boot process will just stop.
check_fork ()
{
  if grep -q "^[[:space:]]*fork[[:space:]]*=[[:space:]]*no.*" $CFGFILE; then
    echo "Not starting $DESC: fork=no specified in config file. Run /etc/init.d/kamailio debug instead."
    exit 1
  fi
}


check_kamailio_config ()
{
  # Check if kamailio configuration is valid before starting the server.
  set +e
  out=$($DAEMON -f $CFGFILE -M $PKG_MEMORY -c 2>&1 > /dev/null)
  retcode=$?
  set -e
  if [ "$retcode" != '0' ]; then
    echo "Not starting $DESC: invalid configuration file!"
    echo -e "\n$out\n"
    exit 1
  fi
}


check_homedir ()
{
  # Create HOMEDIR directory in case it doesn't exist.
  # Useful in Ubuntu as /var/run/ content is deleted in shutdown.
  if [ ! -d $HOMEDIR ]; then
    mkdir $HOMEDIR
  fi

  # Set the appropiate owner and group
  chown ${USER}:${GROUP} $HOMEDIR
}


create_radius_seqfile ()
{
  # Create a radius sequence file to be used by the radius client if
  # radius accounting is enabled. This is needed to avoid any issue
  # with the file not being writable if kamailio first starts as user
  # root because DUMP_CORE is enabled and creates this file as user
  # root and then later it switches back to user kamailio and cannot
  # write to the file. If the file exists before kamailio starts, it
  # won't change it's ownership and will be writable for both root
  # and kamailio, no matter what options are chosen at install time
  RADIUS_SEQ_FILE=$HOMEDIR/kamailio_radius.seq

  if [ ! -f $RADIUS_SEQ_FILE ]; then
      touch $RADIUS_SEQ_FILE
  fi

  chown ${USER}:${GROUP} $RADIUS_SEQ_FILE
  chmod 660 $RADIUS_SEQ_FILE
}


if [ ! -f $DAEMON ]; then
  echo "No $DESC daemon at $DAEMON."
  case "$1" in
  status)
    # LSB - 4: program or service status is unknown.
    exit 4
    ;;
  *)
    # LSB - 5: program is not installed.
    exit 5
    ;;
  esac
fi


# Load startup options if available.
if [ -f $DEFAULTS ]; then
  . $DEFAULTS || true
fi


if [ "$RUN_KAMAILIO" != "yes" ]; then
  echo "$DESC not yet configured. Edit $DEFAULTS first."
  exit 0
fi


set -e


SHM_MEMORY=$((`echo $SHM_MEMORY | sed -e 's/[^0-9]//g'`))
PKG_MEMORY=$((`echo $PKG_MEMORY | sed -e 's/[^0-9]//g'`))
[ $SHM_MEMORY -le 0 ] && SHM_MEMORY=3096
[ $PKG_MEMORY -le 0 ] && PKG_MEMORY=128
[ -z "$USER" ]  && USER=kamailio
[ -z "$GROUP" ] && GROUP=kamailio


if test "$DUMP_CORE" = "yes" ; then
  # set proper ulimit.
  ulimit -c unlimited

  # directory for the core dump files.
  # COREDIR=/tmp/corefiles
  # [ -d $COREDIR ] || mkdir $COREDIR
  # chmod 777 $COREDIR
  # echo "$COREDIR/core.%e.sig%s.%p" > /proc/sys/kernel/core_pattern
fi


if [ "$SSD_SUID" != "yes" ]; then
  OPTIONS="-f $CFGFILE -P $PIDFILE -m $SHM_MEMORY -M $PKG_MEMORY -u $USER -g $GROUP"
  SSDOPTS=""
else
  OPTIONS="-f $CFGFILE -P $PIDFILE -m $SHM_MEMORY -M $PKG_MEMORY"
  SSDOPTS="--chuid $USER:$GROUP"
fi


start_kamailio_daemon ()
{
  start-stop-daemon --start --quiet --pidfile $PIDFILE $SSDOPTS \
    --exec $DAEMON -- $OPTIONS
  res=$?

  echo -n "$NAME "
  if [ $res -eq 0 ] ; then
    echo "started."
    exit 0
  else
    if [ ! -r "$PIDFILE" ]; then
      echo "error, failed to start."
      exit 1
    elif read pid < "$PIDFILE" && ps -p "$pid" > /dev/null 2>&1; then
      echo "already running."
      exit 0
    else
      echo "error, failed to start ($PIDFILE exists)."
      exit 1
    fi
  fi
}


case "$1" in
  start|debug)
    check_kamailio_config
    check_homedir
    create_radius_seqfile

    if [ "$1" != "debug" ]; then
      check_fork
    fi

    echo "Starting $DESC:"
    set +e
    start_kamailio_daemon
    ;;

  stop)
    echo -n "Stopping $DESC: $NAME "
    set +e
    start-stop-daemon --oknodo --stop --quiet --pidfile $PIDFILE \
      --exec $DAEMON

    if [ $? -eq 0 ] ; then
      echo "stopped."
      exit 0
    else
      echo "failed to stop."
      exit 1
    fi
    ;;
    
  restart|force-reload)
    check_kamailio_config
    check_homedir
    create_radius_seqfile

    echo "Restarting $DESC:"
    set +e
    start-stop-daemon --oknodo --stop --quiet --pidfile $PIDFILE --retry=5 \
      --exec $DAEMON
    if [ $? -ne 0 ] ; then
      echo "$NAME failed to stop."
      exit 1
    fi
    start_kamailio_daemon
    ;;

  status)
    echo -n "Status of $DESC: $NAME "
    if [ ! -r "$PIDFILE" ]; then
      echo "is not running."
      exit 3
    fi
    if read pid < "$PIDFILE" && ps -p "$pid" > /dev/null 2>&1; then
      echo "is running."
      exit 0
    else
      echo "is not running but $PIDFILE exists."
      exit 1
    fi
    ;;

  *)
    N=/etc/init.d/$NAME
    echo "Usage: $N {start|stop|restart|force-reload|debug|status}" >&2
    exit 1
    ;;
esac


exit 0
